pgsql: pg_dump: Remove "blob" terminology

pg_dump: Remove "blob" terminology

For historical reasons, pg_dump refers to large objects as "BLOBs".
This term is not used anywhere else in PostgreSQL, and it also means
something different in the SQL standard and other SQL systems.

This patch renames internal functions, code comments, documentation,
etc. to use the "large object" or "LO" terminology instead.  There is
no functionality change, so the archive format still uses the name
"BLOB" for the archive entry.  Additional long command-line options
are added with the new naming.

Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/868a381f-4650-9460-1726-1ffd39a270b4%40enterprisedb.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/35ce24c333cf6dee3c92bc5f67553c7720bd9988

Modified Files
--------------
doc/src/sgml/ref/pg_dump.sgml               |  16 ++-
src/bin/pg_dump/pg_backup.h                 |  12 +-
src/bin/pg_dump/pg_backup_archiver.c        |  78 +++++-----
src/bin/pg_dump/pg_backup_archiver.h        |  34 ++---
src/bin/pg_dump/pg_backup_custom.c          |  66 ++++-----
src/bin/pg_dump/pg_backup_db.c              |   4 +-
src/bin/pg_dump/pg_backup_directory.c       | 112 +++++++--------
src/bin/pg_dump/pg_backup_null.c            |  50 +++----
src/bin/pg_dump/pg_backup_tar.c             |  68 ++++-----
src/bin/pg_dump/pg_dump.c                   | 216 ++++++++++++++--------------
src/bin/pg_dump/pg_dump.h                   |   8 +-
src/bin/pg_dump/pg_dump_sort.c              |  16 +--
src/bin/pg_dump/t/002_pg_dump.pl            |  46 +++---
src/test/modules/test_pg_dump/t/001_base.pl |   2 +-
14 files changed, 367 insertions(+), 361 deletions(-)